does your car have mods?? if so, that can be the problem. i have the same problem with my 94 TT bpu...mine doesnt turn off, it just feel like the engine want to die on me when i a go 90+MPH....i was told that the car isnt getting enough fuel at high RPM..so all i needed to do was to adjust my FCD(fuel cut defenser).....maybe you can try and see if your local performance shop can figure out the problem on your car. EVERY CAR IS DIFFERENT, SO DONT TAKE MY WORD FOR IT!!